Intake silencer



I 1 644%4 06b 11, 1927. A. AROFF 9 9 INTAKE SILENCER Filed April 21, l926 ATTORNEY Patented Och 1L 1%27.

ALEXANDER V. SAHAXEQFF, 9F GINCINHATIE, OHIO, ASSIGNOE T WQETHINGTQI? PUMP AND MACHINERY CQREORATIUN, YORK, N. Y., A CORPORATIQE 01E VIE:-

GINIA.

INTAKE SILEN'CER.

Application 'siea April 21, 1926. Serial No. mates This invention relates to an. intake si lencer particularly designed for use on air compressors and analogous mechanisms wherein air or gas is drawn into the cylim 6 der of the machine, preferably by the suetion of the machine during operation.

An object of the present invention is to provide a silencer or muffler which will effectively muflle or reduce the noises caused by air or gases entering a chamber or cylinder of a machine, the said silencer including a pulsating chamber into which the air or gas is drawn by the suction'operation of the mechanism through an inlet tube of smaller area than the pulsating chamber, which inlet tube has a choked or reduced inlet to allow an uninterrupted flow of air into the tube and from the tube into the pulsating chamber, thereby eliminating the noises contingent with the suction of air or gas into the machine as well as eliminating the noise of the back-puif in the suction.

"With these objects in view, the invention consists in various features of construction and combination of arts, which will be first described in connection with the accompanying drawings, showin an intake silencer of the preferred form em odying the invention, and the features forming the invention will be specifically pointed out in the claim.

Figure 1 is a vertical longitudinal section through the improved silencer.

Figure 2 is a vertical cross-section through the silencer taken on the line 2-2 of Figure 1.

'Figure 3 is ahorizontal section throu h. the silencer taken on the line 3--3 of Fig ure 1.

Referring more particularly to the drawings, the improved suction or intake muffler includes a casing 1, which is preferably of cylindrical construction, and has one" end open asshown at 2. A plug 1S fitted into the opening 2 and held therein'against displacement by a set screw 4. The plug 3 is provided with a threaded bore 5 into which an inlet nipple 6 is threaded. The bore 5- is countersunk .and threaded and the inlet end of the inlet-tube 7 is threaded into the threaded countersunk portion 8 of the bore 5. The inlet-tube 7 extends longitudinally in a pulsating chamber 9 formed within. the casing 1, and extended laterally, as clearly shown in Figures 2 and 3 of the drawing, to provide a relatively thin wide outlet-opening 1 0 from which the air or gas passes into the pulsat ing chamber 9. The walls of the inlet tube 7 curve inwardly as they approach the wide, thin outlet-opening 10. It is preferable to make the area of the outlet-opening 10 greater than the area of the inlet bore 11 of the inlet nipple 6 so as topermit air or gas. to pass from the tube '7, freely into the pulsating chamber 9 where it is permitted to expand and accumulate. The air or gas is drawn from the pulsating chamber 9 through the outlet-opening 12 The outlet-opening 12 is positioned at one side of the pulsating chamber 9 and at the end of the casing remote from the inlet.

The cross-sectional area of the tube 7 is greater than the crosssectional area of the inlet bore 11 thereby providing a restricted or choked entrance into the tube 7 and pulsating chamber 9 which allows an interrupted flow of air into the expansion or pulsating chamber 9. By properly proportioning the pulsating or expansion chamber 9, the pressure in the expansion chamber is kept below atmosphere and the back-puff and noise contingent therewith is absorbed in. the

chamber 9 and muffled and prevented from interfering with the inlet of air through the restricted nozzle opening 11,

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown but that these may be modified widely within the inven tion defined by the claim: 7

What I claim is:

In an intake silencer, an outer casing forming a pulsation chamber, a tube concentric within said chamber, the said tube having a choked inlet and a single relatively wide, narrow outlet opening into said chainher, the walls of said tube curving inwardly as they approach said outlet In testimon whereof I afiix my signature,

ALE NDER V SAHAROFFQ and it has its outlet end flattened 

